ARRT Bone Density Exam Study Set Questions and Answers 100% Pass

ARRT Bone Density Exam Study Set Questions and Answers 100% Pass According to the WHO criteria, what is the diagnosis of osteoporosis based on the measurement of bone density? - ANSWER -2.5 SD or more below the young adult peak bone density What is the gold standard technique for measuring bone density? - ANSWER -DXA Cancellous bone is also know as? - ANSWER -Trabecular Bone What is the anatomical landmark on the proximal femur that gives the best visual indication of the degree of rotation of the proximal femur? - ANSWER -Lesser Trochanter Which lumbar vertebra is described as having a characteristic shape of an X or and H on a DXA PA spine scan? - ANSWER -L4 Is Forteo a bisphosphonate? - ANSWER -NO Quantitative Computated Tomography (QCT) - ANSWER --measurements are volumetric -trabecular bone can be isolated from cortical bone -accuracy may be affected by marrow fat Peripheral BMD measurements are advocated for _____________? - ANSWER -Screening What is the most important clinical consequence of osteoporosis? - ANSWER -Fracture 2 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. What is the name of the tool that integrates clinical information in a quantitative manner to predict a 10- year probability of major osteoporotic fracture for both men and women? - ANSWER -FRAX What is the major source of precision error in clinical practice? - ANSWER -Technologist What is the percentage of trabecular bone in the skeleton? - ANSWER -20 % The forearm is not used to monitor the effects of therapy for osteoporosis because....... - ANSWER - rate of change in BMD is too slow What site is mostly composed of cortical bone? - ANSWER -Proximal forearm What are the advantages of QUS over x-ray methodologies for BMD measurement? - ANSWER -- ultrasound is comparatively inexpensive -patients are not subjected to ionizing radiation -ultrasound exams are quick to perform What is the name of the isotope that was used in SPA? - ANSWER -Iodine-125 What is the texture index that evaluates the pixel gray-level variations in lumber spine DXA images? - ANSWER -TBS (Trabecular Bone Score) When does type 2 primary osteoporosis generally occur? - ANSWER -after age 70 What technique used images of the hand and an aluminum wedge? - ANSWER -RA (Radiograhic Absorptiometry) New bone is formed by the ___________? - ANSWER -osteoblasts 3 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. Cancellous bone is also known as _______________? - ANSWER -Trabecular bone How would you start labeling the vertebral bodies on a PA lumbar scan? - ANSWER -Start at L4 and count/label up With changes in rotation of the femoral neck, what happens? - ANSWER -Increases the BMD If daily QC fails, what should be your first step of action? - ANSWER --repeat the scan -if scan fails again, then call for help Although the technology is similar with all of the DXA units, the BMD results are different because.......... - ANSWER --different calibration standards -algorithms to calculate BMD -differences in the ROI -different databases The primary mechanism of action of antiresorptive therapies is the direct interaction with the __________________ - ANSWER -osteoclasts Which site is preferred for determination of fracture prediction? - ANSWER -proximal femur What is one disease not associated with low BMD? - ANSWER -osteopetrosis DXA results may be influenced by......... - ANSWER --body thickness 4 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. -degenerative changes -fractures -scan mode A great forearm scan should include....... - ANSWER --forearm centered -forearm straight -free of artifacts Phantoms that mimic the shape and size of a skeletal region are called ______________________________. - ANSWER -anthromomorphic phantoms What is the formula used to calculate BMD? - ANSWER -BMD = BMC/Area How often should you perform the QA on the DXA unit? - ANSWER -everyday you scan Radiogammetry is the measurement of bones using skeletal x-rays/radiographs. Which site was often used? - ANSWER -metacarpals With voltage switching units, what type of calibration is used? - ANSWER -continuous internal calibration--wheel or drum 5 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. For low energies, the most common process of absorption is the ________________________ effect. - ANSWER -photoelectric What are some comparisons to the amount of effective dose given during a central DXA scan? - ANSWER --less than a day of background radiation -less than a round trip from Boston to LA -one-tenth of a chest xray Why is the non-dominant arm used in bone densitometry? - ANSWER -reference values reflect n